From: Florian Fainelli f.fainelli@gmail.com
[ Upstream commit b9ceca6be43233845be70792be9b5ab315d2e010 ]
When more than a single SCMI device are present in the system, the creation of the notification workqueue with the WQ_SYSFS flag will lead to the following sysfs duplicate node warning:
sysfs: cannot create duplicate filename '/devices/virtual/workqueue/scmi_notify' CPU: 0 PID: 20 Comm: kworker/0:1 Not tainted 5.9.0-gdf4dd84a3f7d #29 Hardware name: Broadcom STB (Flattened Device Tree) Workqueue: events deferred_probe_work_func Backtrace: show_stack + 0x20/0x24 dump_stack + 0xbc/0xe0 sysfs_warn_dup + 0x70/0x80 sysfs_create_dir_ns + 0x15c/0x1a4 kobject_add_internal + 0x140/0x4d0 kobject_add + 0xc8/0x138 device_add + 0x1dc/0xc20 device_register + 0x24/0x28 workqueue_sysfs_register + 0xe4/0x1f0 alloc_workqueue + 0x448/0x6ac scmi_notification_init + 0x78/0x1dc scmi_probe + 0x268/0x4fc platform_drv_probe + 0x70/0xc8 really_probe + 0x184/0x728 driver_probe_device + 0xa4/0x278 __device_attach_driver + 0xe8/0x148 bus_for_each_drv + 0x108/0x158 __device_attach + 0x190/0x234 device_initial_probe + 0x1c/0x20 bus_probe_device + 0xdc/0xec deferred_probe_work_func + 0xd4/0x11c process_one_work + 0x420/0x8f0 worker_thread + 0x4fc/0x91c kthread + 0x21c/0x22c ret_from_fork + 0x14/0x20 kobject_add_internal failed for scmi_notify with -EEXIST, don't try to register things with the same name in the same directory. arm-scmi brcm_scmi@1: SCMI Notifications - Initialization Failed. arm-scmi brcm_scmi@1: SCMI Notifications NOT available. arm-scmi brcm_scmi@1: SCMI Protocol v1.0 'brcm-scmi:' Firmware version 0x1
Fix this by using dev_name(handle->dev) which guarantees that the name is unique and this also helps correlate which notification workqueue corresponds to which SCMI device instance.
Link: https://lore.kernel.org/r/20201014021737.287340-1-f.fainelli@gmail.com Fixes: bd31b249692e ("firmware: arm_scmi: Add notification dispatch and delivery") Signed-off-by: Florian Fainelli f.fainelli@gmail.com [sudeep.holla: trimmed backtrace to remove all unwanted hexcodes and timestamps] Signed-off-by: Sudeep Holla sudeep.holla@arm.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/firmware/arm_scmi/notify.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/firmware/arm_scmi/notify.c b/drivers/firmware/arm_scmi/notify.c index 4d9f6de3a7fae..51c5a376fb472 100644 --- a/drivers/firmware/arm_scmi/notify.c +++ b/drivers/firmware/arm_scmi/notify.c @@ -1474,7 +1474,7 @@ int scmi_notification_init(struct scmi_handle *handle) ni->gid = gid; ni->handle = handle;
- ni->notify_wq = alloc_workqueue("scmi_notify", + ni->notify_wq = alloc_workqueue(dev_name(handle->dev), WQ_UNBOUND | WQ_FREEZABLE | WQ_SYSFS, 0); if (!ni->notify_wq)